Measurement of the branching ratio and form factor of KL → μ+ μ- γ -: art. no. 071801

被引：22

作者：

Alavi-Harati, A

Alexopoulos, T

Arenton, M

Arisaka, K

Averitte, S

Barker, AR

Bellantoni, L

Bellavance, A

Belz, J

Ben-David, R

Bergman, DR

Blucher, E

Bock, GJ

Bown, C

Bright, S

Chen, E

Childress, S

Coleman, R

Corcoran, MD

Corti, G

Cox, B

Crisler, MB

Erwin, AR

Ford, R

Glazov, A

Golossanov, A

Graham, G

Graham, J

Hagan, K

Halkiadakis, E

Hamm, J

Hanagaki, K

Hidaka, S

Hsiung, YB

Jejer, V

Jensen, DA

Kessler, R

Kobrak, HGE

LaDue, J

Lath, A

Ledovskoy, A

McBride, PL

Mikelsons, P

Monnier, E

Nakaya, T

Nelson, KS

Nguyen, H

O'Dell, V

Pang, M

Pordes, R

机构：

[1] Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA

[2] Univ Arizona, Tucson, AZ 85721 USA

[3] Univ Calif Los Angeles, Los Angeles, CA 90095 USA

[4] Univ Calif San Diego, La Jolla, CA 92093 USA

[5] Univ Colorado, Boulder, CO 80309 USA

[6] Elmhurst Coll, Elmhurst, IL 60126 USA

[7] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA

[8] Osaka Univ, Osaka 5600043, Japan

[9] Rice Univ, Houston, TX 77005 USA

[10] Rutgers State Univ, Piscataway, NJ 08854 USA

[11] Univ Virginia, Dept Phys, Charlottesville, VA 22901 USA

[12] Univ Virginia, Inst Nucl & Particle Phys, Charlottesville, VA 22901 USA

[13] Univ Wisconsin, Madison, WI 53706 USA

来源：

PHYSICAL REVIEW LETTERS | 2001年 / 87卷 / 07期

关键词：

D O I：

10.1103/PhysRevLett.87.071801

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report on the analysis of the rare decay K-L--> mu (+)mu (-)gamma the 1997 data from the KTeV experiment at Fermilab. A total of 9327 candidate events are observed with 2.4% background, representing a factor of 40 increase in statistics over the current world sample. We find that B(K-L --> mu (+)mu (-)gamma) = (3.62 +/-0.04(stat)+/-0.08(syst)) x 10(-7). The form factor parameter alpha (K*) is measured to be alpha (K*) = -0.160(-0.028)(+0.026). In addition, we make the first measurement of the parameter alpha from the D'Ambrosio-Isidori-Portoles form factor, finding alpha = -1.54 +/-0.10. In that model, this alpha measurement limits the Cabibbo-Kobayashi-Maskawa parameter rho > -0.2.

引用

页码：71801 / 1

页数：4

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